The elastic properties of a natural phlogopite have been studied by in-situ high-pressure X-ray powder diffraction experiments on the ID9 beamline at the ESRF, at room temperature. Several EoS models (Birch-Murnaghan, Vinet, Poirier-Tarantola) have been fitted to the experimental P-V data and the results obtained are presented and discussed. The third-order Birch-Murnaghan EoS, assuming V0 fixed at its experimental value, yields K0 = 49.7(±0.5) GPa, K’0 =8.59(±0.19), K’0 =-0.5953 GPa−1 (implied value). The axial compressibilities at room conditions, determined by the third-order Birch-Murnaghan EoS, result in βEoSa0=3.48(5), βEoSb0=3.2(1), βEoSc0=13.2(1) 10−3 GPa−1. Equilibrium thermodynamic calculations have been carried out to show how the new elastic parameters here reported affect the stability field of phlogopite.

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.